3d_sound.exe is a Trojan.Riados-A. 3d_sound.exe opens a back door. Related files: %System%\3d_sound.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill 3d_sound.exe process and remove 3d_sound.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.